I was in a small, enclosed Jomtien restaurant yesterday, enjoying breakfast. There were several other customers having quiet conversations.
Two men came in, sat down and began talking in voices more suited to an iron foundry, really loud and intrusive. I won't mention their nationality as no nation is immune to rude behavior. Then one started a phone conversation, literally yelling at the person on the other end.
I and the others just sat there, annoyed but not wanting to initiate what would almost certainly be a fruitless confrontation but the Thai cook/owner surprised us all as he emerged from the kitchen, pointed to the door and told them to pay and get out! They were as shocked as the rest of us were! Actually said: "Sorry, sorry." as they paid up and left.
We applauded.